I went to the source so I could read the article. Basically it boils down to the assertion that personality assessments that are based on Jung’s models are divination. This is based on allegations that Jung was involved in occult and pagan practices (which I will accept as true). But to say that taking a personality assessment is divination is ridiculous. There is an incredible body of research done on human behavior. Much of it falls in hard science. I do not like Rick Warren. I believe he is a wolf in sheep’s clothing but much of this article is just way out there.
I looked around the website this goes to and there are a lot of really crazy assertions made. Example, special portals that angels went through to enter mans time/space. There is no biblical basis for that.
That's exactly what it looks like.
Even suggesting that the use of numbers to express the degree of a particular personality trait is somehow linked to numerology, and thereby linked to divination, is downright silly.
That's like saying your doctor is using divination if he asks you to rank your joint pain on a scale of 1 to 5.
Like you, I don't like Rick Warren either, but this article "appears" to be making connections between personality assessments (which are quite helpful) and the occult and that is a strange accusation, to say the least.
As an aside, personality assessments can be incredibly useful to Christians. If a person takes an assessment that indicates to him that he is impulsive, it forearms him with the knowledge that he should avoid certain temptations (because in his impulsiveness, he might fall prey to them).
That most certainly is not divination.